I've read a little above this, here is what I've found when reloading brand new brass verses brass shot at least once.
brand new brass
when I use brand new, never shot brass for what ever caliber, .243, .45 colt, 9mm, it seems what ever process they use to either shine up the brass or make the brass, there's just enough build up of shine to get in the way of a 'right' fit for primers, a good scrubbing w/ a primer pocket brush takes care of this.
Brass shot, at least once, has had the pockets worn in. Some cases and primers seem to be tighter some looser.
I've got some FP cases and winchester primers and it's easy to load in the primers, but windhester cases and whinchester primers, it's tighter / stiffer to load the primers. (shrugs)
Presses. I've used a RCBS turret press and a dillon 650 press. my .243 is on the rcbs turret press.
I dont use the press to prime my rifle cases, as it does not always seem to me to be quite deep enough or right.
So I like the Lee auto prime. It's a hand loading press / thing that you put your primers onto a trey, it's got a cover, and you press in the primers by hand.
It slows down the process but you can 'feel' very accurately how deep you need to go with your primers. oh, cost is around 20 bucks.
Now on the other hand, for my rifle cases I always brush out the pockets. but for my pistol cases (45 colt, 9mm, 38/357) I usually dont bother brushing out the pockets, after all I'm just target shooting. but for hunting and accuracy, clean them out.
hope this helps.
Stevedinaz